Use good quality varietal nuts. It is very difficult to get a whole kernel from a greedy nut, and there is no way to increase the yield of a whole kernel from such a nut.
When splitting, use dry nuts in moderation. Wet fresh walnut has high elasticity; during splitting, the shell cracks and does not disintegrate. It is possible to damage the kernel of a fresh nut only with mechanical stress. Overdried walnut, which happens at the end of the season (spring-summer) and when stored improperly, becomes very fragile and at the slightest impact, the kernel of the walnut crumbles. For small amounts, overdried walnuts can be soaked briefly or placed in a humid environment. Having saturated with moisture, the nut will restore its elasticity and the yield of the whole kernel will increase.
! After splitting, the kernel must be dried.
In industrial processing, it is best to avoid over-dried nuts.
Use quality equipment. Manufacturers of industrial equipment for the processing of walnuts are trying to take into account all the nuances and produce equipment that will give a high yield of the whole kernel. Therefore, it is important to buy equipment from trusted suppliers who offer a guarantee and support.
At home, it is better to use mechanical equipment or a hammer rather than rush to buy electric nutcrackers. Indeed, with a point split, the nucleus is least of all exposed to damage.
Calibrate the nut before splitting. Calibration is not necessary when using mechanical nutcracker and hammer. But electric roll nutcrackers need to calibrate the nut and without it they give a low yield of the whole kernel.
Industrial cone nutcrackers are capable of working without calibration. However, it makes it easier and faster to set up the nutcracker, increases the percentage of whole kernels and allows you to get kernels of approximately the same size.
Also, the kernel can break during transportation, so it is advisable to reduce the number of movements, carefully transfer and transport the core, and pack it with high quality.
It is unlikely that it will be possible to get 100% of the whole kernel, however, using high-quality huskies and calibrating it before splitting, you can get the percentage of the whole kernel declared in the characteristics of the equipment. When manually splitting a wet nut, you can even get up to 95% of the whole kernel.